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WILLIS 44

MIDLAND County · District 8 · DIAMONDBACK E&P LLC · SPRABERRY (TREND AREA)

Permits

Max Depth

12,000 ft

First Permit

2004-08-20

Latest Activity

2017-03-09

Lifespan

13 yrs

Regulatory Status

Schedule

ON SCHEDULE

Completion

2005-08-29

Shut-In

—

Plugged

—

P-5 Org Status: X

EWA / Permit operator mismatch

Scheduling: DIAMONDBACK E&P LLC ≠ Permit: ENDEAVOR ENERGY RESOURCES L.P.

Resolved via: production → DIAMONDBACK E&P LLC

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

2003-02

Last Production

2026-07

Operator History

Chain of Custody

ENDEAVOR ENERGY RESOURCES L.P. 2003-2024→ DIAMONDBACK E&P LLC 2025-2026

Lease Production

Production is reported at the lease level. View production data, decline curves, and history on the lease page.

Oil

production & DCA →

Formation Tops (9) Elevation 2,723 ft (GR)

CSV

Formation	Top Depth (MD)	Subsea (+above / −below SL)
SPRABERRY	7,450 ft	-4,727 ft
LOWER SPRABERRY (Spraberry)	8,000 ft	-5,277 ft
DEAN	8,800 ft	-6,077 ft
UPPER WOLFCAMP (Wolfcamp)	9,325 ft	-6,602 ft
WOLFCAMP	9,325 ft	-6,602 ft
STRAWN	10,425 ft	-7,702 ft
BEND	10,630 ft	-7,907 ft
ATOKA SHALE (Atoka)	10,790 ft	-8,067 ft
DEVONIAN	11,560 ft	-8,837 ft

As reported by operators on W-2/G-1 completion filings (RRC wellbore records). Depths are measured depth; names appear as filed. Subsea = reported elevation − measured depth (negative = below sea level; vertical wellbores only). View filings & logs at RRC ↗

Perforations (2)

Interval	Type
8,051–10,325 ft	Perforated
8,051–11,633 ft	Perforated

Casing (3)

Size	Set Depth	Cement
12.75"	388 ft	370 sx
8.625"	5,033 ft	425 sx
4.5"	11,695 ft	455 sx

Permit History (2)

#823825 Recompletion Final Completion

WILLIS '44' · 11,700 ft

2017-03-09

#549602 Drill Final Completion

WILLIS "44" · 12,000 ft

2004-08-20

Spud 2004-10-04

Applications (2)

#823825 A ENDEAVOR ENERGY RESOURCES L.P.

received 2017-02-28

#549602 A ENDEAVOR ENERGY RESOURCES L.P.

received 2004-08-13

Records & Logs

3 completion filings on record · 1 with log images at RRC.

W-2/G-1 2017-03-18

W-2/G-1 2005-10-03 log on file

W-2/G-1 2005-12-09

Completion packets + logs ↗ Wellbore filings ↗

Completion packets open directly (post-2011 filings include attached logs). Log images can't be deep-linked — clicking copies the API for you to paste.

No GPS coordinates yet

Coordinates come from the RRC GIS backfill and usually appear within days of permit issuance. Located in MIDLAND County.

Well Details

Well Number: 4
Max Depth: 12,000 ft
Drill Type: Vertical
County: MIDLAND
District: 8
Operator: DIAMONDBACK E&P LLC
Completed: 2005-08-29

Operator

Name: DIAMONDBACK E&P LLC
Location: MIDLAND
P-5 Status: X (filed 2026-05-04)
Cum Oil (all leases): 986,290,193 bbl
Cum Gas (all leases): 41,995,553 mcf
Activities: GTHS/C, GTHS/O, OPRS/G, OPRS/O
Total Permits: 4,977